EP 1395802 A1 20040310 - HIGH SENSITIVITY PRESSURE SENSOR WITH LONG TERM STABILITY
Title (en)
HIGH SENSITIVITY PRESSURE SENSOR WITH LONG TERM STABILITY
Title (de)
HOCHEMPFINDLICHER DRUCKSENSOR MIT LANGZEITSTABILITÄT
Title (fr)
CAPTEUR DE PRESSION A SENSIBILITE ELEVEE PRESENTANT UNE STABILITE A LONG TERME
Publication
Application
Priority
- US 0216608 W 20020524
- US 29358101 P 20010525
Abstract (en)
[origin: US2002174706A1] A high sensitivity pressure sensor with long term stability including a housing with first and second chambers, a membrane separating the first and second chambers, a first electrode located in the first chamber and spaced from one side of the membrane forming a first capacitor therewith, and a second electrode located in the second chamber and spaced from an opposite side of the membrane forming a second capacitor therewith. A measuring circuit is connected across the first and second capacitors for measuring membrane displacement by detecting differences in capacitance between the first and second capacitors and a compensation circuit is configured to apply an electric field to the membrane as a compensating force by reducing the voltage difference between the first electrode and the membrane and simultaneously increasing the voltage difference between the second electrode and the membrane or vice versa to provide long term stability. The invention also features a unique compensation circuit for a pressure sensor and a method of making and operating a pressure sensor.
IPC 1-7
IPC 8 full level
G01L 13/06 (2006.01); G01L 9/00 (2006.01); G01L 9/12 (2006.01); G01L 13/02 (2006.01); G01L 19/02 (2006.01); G01L 19/04 (2006.01)
CPC (source: EP KR US)
G01L 9/0072 (2013.01 - EP US); G01L 9/12 (2013.01 - EP KR US); G01L 9/125 (2013.01 - EP US); G01L 13/025 (2013.01 - EP US); G01L 19/02 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 2002174706 A1 20021128; US 6813954 B2 20041109; CN 1250951 C 20060412; CN 1511252 A 20040707; DE 60228245 D1 20080925; EP 1395802 A1 20040310; EP 1395802 A4 20051026; EP 1395802 B1 20080813; JP 2004528576 A 20040916; KR 20040004650 A 20040113; WO 02097387 A1 20021205
DOCDB simple family (application)
US 15394802 A 20020523; CN 02810653 A 20020524; DE 60228245 T 20020524; EP 02734542 A 20020524; JP 2003500519 A 20020524; KR 20037015355 A 20031124; US 0216608 W 20020524